Data

Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls

Australian Antarctic Data Centre
TERHUNE, JOHN MOORE
Viewed: [[ro.stat.viewed]] Cited: [[ro.stat.cited]] Accessed: [[ro.stat.accessed]]
ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adc&rfr_id=info%3Asid%2FANDS&rft_id=info:doi10.4225/15/55EF8FC681CF3&rft.title=Repetition patterns in Weddell seal (Leptonychotes weddellii) underwater multiple element calls&rft.identifier=10.4225/15/55EF8FC681CF3&rft.publisher=Australian Antarctic Data Centre&rft.description=Many vocalisations produced by Weddell seals (Leptonychotes weddellii) are made up of repeated individual distinct sounds (elements). Patterning of multiple element calls was examined during the breeding season at Casey and Davis, Antarctica. Element and interval durations were measured from 405 calls all greater than 3 elements in length. The duration of the calls (22 plus or minus 16.6s) did not seem to vary with an increasing number of elements (F4.404 = 1.83, p = 0.122) because element and interval durations decreased as the number of elements within a call increased. Underwater vocalisations showed seven distinct timing patterns of increasing, decreasing, or constant element and interval durations throughout the calls. One call type occurred with six rhythm patterns, although the majority exhibited only two rhythms. Some call types also displayed steady frequency changes as they progressed. Weddell seal multiple element calls are rhythmically repeated and thus the durations of the elements and intervals within a call occur in a regular manner. Rhythmical repetition used during vocal communication likely enhances the probability of a call being detected and has important implications for the extent to which the seals can successfully transmit information over long distances and during times of high level background noise. See other metadata records and datasets associated with ASAC project 2122 (ASAC_2122) for further information. The fields in this dataset are: Tape/Site/File Filename Call Type Total Number of Elements Attribute Frequency Time Casey Davis&rft.creator=TERHUNE, JOHN MOORE &rft.date=2002&rft.coverage=northlimit=-68.0; southlimit=-68.0; westlimit=72.0; eastLimit=72.0; projection=WGS84&rft.coverage=northlimit=-68.0; southlimit=-68.0; westlimit=72.0; eastLimit=72.0; projection=WGS84&rft.coverage=northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; projection=WGS84&rft.coverage=northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; projection=WGS84&rft_rights=This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2122-2 when using these data.&rft_subject=biota&rft_subject=oceans&rft_subject=ANIMALS/VERTEBRATES&rft_subject=EARTH SCIENCE&rft_subject=BIOLOGICAL CLASSIFICATION&rft_subject=MAMMALS&rft_subject=ATTRIBUTE&rft_subject=CALL TYPE&rft_subject=CALLS&rft_subject=CASEY&rft_subject=DAVIS&rft_subject=ELEMENTS&rft_subject=FREQUENCY&rft_subject=LEPTONYCHOTES WEDDELLII&rft_subject=REPETITION&rft_subject=TIME&rft_subject=TRILLS&rft_subject=UNDERWATER&rft_subject=VOCALISATIONS&rft_subject=WEDDELL SEALS&rft_subject=HYDROPHONES&rft_subject=FIELD SURVEYS&rft_subject=CONTINENT > ANTARCTICA > Davis&rft_subject=CONTINENT > ANTARCTICA > Casey&rft_subject=GEOGRAPHIC REGION > POLAR&rft_place=Hobart&rft.type=dataset&rft.language=English Access the data
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This data set conforms to the CCBY Attribution License (http://creativecommons.org/licenses/by/4.0/). Please follow instructions listed in the citation reference provided at http://data.aad.gov.au/aadc/metadata/citation.cfm?entry_id=ASAC_2122-2 when using these data.

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Brief description

Many vocalisations produced by Weddell seals (Leptonychotes weddellii) are made up of repeated individual distinct sounds (elements). Patterning of multiple element calls was examined during the breeding season at Casey and Davis, Antarctica. Element and interval durations were measured from 405 calls all greater than 3 elements in length. The duration of the calls (22 plus or minus 16.6s) did not seem to vary with an increasing number of elements (F4.404 = 1.83, p = 0.122) because element and interval durations decreased as the number of elements within a call increased. Underwater vocalisations showed seven distinct timing patterns of increasing, decreasing, or constant element and interval durations throughout the calls. One call type occurred with six rhythm patterns, although the majority exhibited only two rhythms. Some call types also displayed steady frequency changes as they progressed. Weddell seal multiple element calls are rhythmically repeated and thus the durations of the elements and intervals within a call occur in a regular manner. Rhythmical repetition used during vocal communication likely enhances the probability of a call being detected and has important implications for the extent to which the seals can successfully transmit information over long distances and during times of high level background noise. See other metadata records and datasets associated with ASAC project 2122 (ASAC_2122) for further information. The fields in this dataset are: Tape/Site/File Filename Call Type Total Number of Elements Attribute Frequency Time Casey Davis

Issued: 2002-05-29

Data time period: 1997-10-21 to 1997-12-01

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72,-68

72,-68

110,-66

110,-66

text: northlimit=-68.0; southlimit=-68.0; westlimit=72.0; eastLimit=72.0; projection=WGS84

text: northlimit=-66.0; southlimit=-66.0; westlimit=110.0; eastLimit=110.0; projection=WGS84

Subjects
ANIMALS/VERTEBRATES | ATTRIBUTE | BIOLOGICAL CLASSIFICATION | CALL TYPE | CALLS | CASEY | CONTINENT > ANTARCTICA > Casey | CONTINENT > ANTARCTICA > Davis | DAVIS | EARTH SCIENCE | ELEMENTS | FIELD SURVEYS | FREQUENCY | GEOGRAPHIC REGION > POLAR | HYDROPHONES | LEPTONYCHOTES WEDDELLII | MAMMALS | REPETITION | TIME | TRILLS | UNDERWATER | VOCALISATIONS | WEDDELL SEALS | biota | oceans |

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AU-ANL:PEAU : http://nla.gov.au/nla.party-617536

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